<!DOCTYPE html><html><head><title>https://yanx57.gitee.io/solution/categories/bfs/</title><link rel="canonical" href="https://yanx57.gitee.io/solution/categories/bfs/"/><meta name="robots" content="noindex"><meta charset="utf-8" /><meta http-equiv="refresh" content="0; url=https://yanx57.gitee.io/solution/categories/bfs/" /></head></html>